Katie Matzell.

Saturday, June 16

Brian Calhoon’s Marimba Cabaret is exactly what you’re hoping it is — Broadway and pop songs sung by a marimba player — and more (there’s another percussionist, too). It’s at Mayo Street Arts (10 Mayo St., Portland) at 8 p.m. Tix: $20-$25 ($15 students). 879-4629. mayostreetarts.org. Over at One Longfellow Square (181 State St.), Portland songstress Katie Matzell and her band perform with the string players of the Amarantos Quartet, who also play an opening set at 8 p.m. Tix: $10 (all ages). 761-1751. onelongfellowsquare.com. And today’s the start of PortFringe, the sprawling eight-day festival of envelope-pushing performances by artists from Maine and away. Full schedule and tix at portfringe.com.